diff --git a/.github/workflows/update-main-source.yml b/.github/workflows/update-main-source.yml
index 005b678e8..24d17151d 100644
--- a/.github/workflows/update-main-source.yml
+++ b/.github/workflows/update-main-source.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   update:
     permissions:
-      contents: write
+      contents: read
       id-token: write
     runs-on: ubuntu-latest
     steps: